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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26b68fe4051558a5c7366ecd69240f38ceb8f7ff1eae6665992829af997d4f9' 
  AND token = 'ySzQcquaCgcX9X3+FOf5eNa9UTG8hvN2ti/xc1Cgvdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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