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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a18bfc544b7608944cfbcb2aa08f2a5bd1496a282ba3c5a7b0e5b61e2cf603' 
  AND token = '1aa/Rjeh1gozhBsVK/yUyALrsy7iDqVgWtDVCHqDTq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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