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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9802c2ea1bd38e4c0fe4c4e3b9fa9a1328bacc25ae7929734564dbb6a5217fed' 
  AND token = 'VUL1TT55ZkgNjWiiAV99tM4nAQ/fHz07A39ZZW3/ylI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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