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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd7f6d88df1a9134dccf67d81fa8eb0c27717a2a1730ecaf3725c5bc95bc2c8' 
  AND token = '6LCDNa/ZmTIUIai8soCxxPNHIDsT617tslFZz3noVZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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