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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2d7570e44f65d4cd4b649637c897648a0bf55f575e5b83dd0c88efcf4848f0' 
  AND token = 'ZqJbTEylB2pAnxiTxQ2vBTE1sm3h2E2ohi8wczb/36k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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