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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e73684947cd60cd4ae7143e049e2a3294abd5a8e005f9bc60cd914629e0bc7' 
  AND token = 'rRKxaetmK2UqqtgG9sja46+gRKTT+r4YawM3G7VgcII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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