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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2b898055912a420135765af29e7ebfba3c0026212d0775e9ca3e0bf1c12ef2' 
  AND token = 'L5K17xvzLm7+/jf/IpPGhzxa5VtfjZcnL/DQo5dRNnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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