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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16d390e91fdd5e3739dcc8a3924210eed3b0c97ccc0b71976e633f30808159e' 
  AND token = 'tFI0Yz9on+PHOH6PjBRQYRXMePFd3IilOq8FcGqCbKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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