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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9bd514a41d35485e3730c210edb49fd190a4b82cf4f4401ce8a1c55dcd13c9' 
  AND token = 'CdyDjDqncXa6h7ZJLV+mMB6+eWO4rtp9rcJZGbbJ4GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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