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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526481073c47692a71932d5e3f36b0b942a3726bc2be08929af959d2e1448efd' 
  AND token = 'yRKoRSUExlvoFVxyCrvVYKeecEKn0pqu6QCNc4R5enQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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