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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbc31d83781217b4477e8a7901ee7dfc032359d8c1698fad4807b3c905466c7' 
  AND token = '1kbxmmfxjus/EVTfpoIgCk2F0/ygnFuGEMRiWC3KhMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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