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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25998a25d4c45f15bb76d5b6e2e7bfb2e23ffab14dbbe14a7e5072f5f9019ac' 
  AND token = 'm1x4qrZkuD/+qH4AO1u1ngSHWrk0DfxFlYcjdb/tpFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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