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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66753047d40b5db213516f845179b403a71516a646f6066483b1645e39c7815a' 
  AND token = 'bKtfNHWcuwcLp8R+QQwg2g/JIuNMLL9iLyx92Bm3TiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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