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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c633b3a57ecd1db3a75111357add4bd2ee6d1fae1212c7b33d3e9ef471e3172a' 
  AND token = '7Crvvmjl4acO7aFzlVXukJB8sUy4awBBDhTT4Jx5ogo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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