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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfac88b7ef08d6f46033dca256e14839807926bd01758d4ca235e738082f299' 
  AND token = 'vtTLTM6BH84e2zW3i8d2FBTXB/bi8lBX1/KvTMuQaOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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