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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d70a73486ae1e5a6a0778d8dd55e3a206fd608d8cccb34e7a4ec89187f073d' 
  AND token = 's3GPWCbw1BhrVukw24jmfiffMraDYbiq3YihqXP+VFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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