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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e65a4ecab2879d15cd26695d2469b345c1a96c0a001b2bfc487c178ffa1beb' 
  AND token = '3FzaRlAZilUid3pEbx8Kf37cHkO6KQMzCZ26GPYfvCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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