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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f905d26f4a169b341fe460fa2227db4eddc4e84b73c8c1e0797ce478baea654' 
  AND token = 'wtTqZ7gWmadxnRJqj9KQbvIyyQ1qlBoULekyq7N4E6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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