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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd728774281b90387a6ffaf5c8a8020c50e4b8450cf0b28546c2d9acacf5abe5b' 
  AND token = 'OfZWDkv2RJ+e9HHI/Op5qY25GrhXznebFiT2CA2GhIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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