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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde397fb3fbb789aaf997210d356cd5f8a0e3617997e578ea066de998f522ac0' 
  AND token = 'oZ9ZaAjVe/66hl5LIUYhCp6LL5NByjtIliogPNZeohg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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