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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cff5df0bdaf74e938c7f44fc0b17bb93236b650b8920e8d134fafcddfbd347' 
  AND token = 'nmnGO7hB2cCMUunMVEdyfFhMr6i0bOVPHWwg2qiBaoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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