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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aeaef9742e8e78e5ca7465c3d12fd95c57f74e9bb3fc2a91f8b29df525119e2' 
  AND token = 'LspAI01da/Oyy0wicwSJtNOWQGhHVAfquCDRZ0gXEw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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