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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5fae90e561085fbd53984d54353f0f31b35480363a2e6eb33be6aa37432e04' 
  AND token = 'n048TDclD+qsm/vfgHFFAiOpU5C4bGK7g8dCdAxmcG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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