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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768439ebfe79c3e9fc601a5c50dcd1f2f79fbf5d2ca740deeb02fb6de776be67' 
  AND token = 'del8CfxNb9zl1P68oizg0gWwbniBfBSb7eEUucAXEyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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