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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac20d9d171a6c97a0d4920fefdaf778f54564d8c3621056841402809e8d52c8' 
  AND token = 'eFb20uaIhIF2YkI1SNfWcUf75zT/iOXHxb47Ina8KW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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