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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37e68ab819b3cebc66258d9ff42427e6326e7cf114f0975e1454110b6e2e74d' 
  AND token = '7UC8kxUom23UlsV0S9eOoV5XBXtW51Q4tR7yEIhQu28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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