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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d331b4eb78ad2c36120d8b0e8ad9728b2d68f36320b1f3d98e222121ddaf43' 
  AND token = 'xTDU7D8aOufFVzFsEEqcco8789CsBHXutmltiR7F3d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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