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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8680071fd6e0aa6ffb83d0e8810560e7b6a280273ee8a398b54a120176eb647b' 
  AND token = 'jsDBW4n+UUx35bLqt/ilxGR1Ta7C11nRjzV8I28O530=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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