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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4549d03c3179739743c4f6d13ab0515b6671a5ea0dba0c755df9a6c4cf7ba8c' 
  AND token = '01Fa/dqe76vRgm6LzW9+SIA+WcipAphH8JynhbURPUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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