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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0242695611886f79333f1ad7ed7823e988aa2329589b02f0a47cd63b09e1444a' 
  AND token = '0cdRE/KF+ztWQWd1zBeFIodfX3u+wzCgbBZ1kek5hPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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