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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b39f2cefa6bba904cfc53e49b7f2a6dd85a00ea32c44d04c307efffd9fcaefa' 
  AND token = 'J+Na4FKz4nTl+K3d6eBIAcR3awccMknSHnySYCRPHfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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