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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986e8209c2780c45a168a962fbc044923d32b2a38a93d8564dd254a0d8567d50' 
  AND token = 'C0YRu0aVUIXfnZsrsogacZsSkH+JtBhABkmPNvgnY1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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