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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a78045d405d9b5ea6e9d6b28e5f2479c77d87b37fb7fb4248c222893659ec2' 
  AND token = 'D6tU2rEkyA9c5GjHckA42ufjHDOnfAqMDJPdnSWFFBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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