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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c42a186cb14873792c1f433fbcf8b470afadeb48e5bda63bde6d16eae38757' 
  AND token = 'iRVhbqW5IkhEJK+o2qATm8DIRqjMtK7tq3d6kDAusWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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