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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429c5c14f528d8e3c197d0072986b7c93fd900a6c48bf0357e9d28afadedbeca' 
  AND token = 'bP9wnxEt4iy6o4pVepgAHrTrOihQDY46RGJAo9FF/pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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