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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bcce72b1a1e7c2d83bcca2076fef4899a0f208b3eea20fde9465ce9272270c' 
  AND token = 'eslqMO1OPFOhrB2ms4W/cpVXhdZwHGr6wejfPijfffc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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