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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b17789c24525c4dddd0a4d0b7d16a0885947dac954973a1dd3efc685f6ba097' 
  AND token = 'u0Fh30nN0ol60JGPtL/TtAEfIM19ycczL1Ij0baQIAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}