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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9e6e029209b1a38c9af24bf5cf1111dd86d65058c72f4ce4afd3ec2c2c0dcc' 
  AND token = 'J9PrISPppjkJDUnTO050HFQZnPPDT46G8mwBeZjFtgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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