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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03ebc279902a0fdace29eb5b2be7514573f7e246340ed8e72bae5211486f297' 
  AND token = 'ra3hv1oLQDvuMjwyqQi5AGQSCK6T/pmKy4JlIvgSn60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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