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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f3f87b8e11d0c3e4844de0a70fd119429ecad866f9ba383382ea58cb5cde6f' 
  AND token = '0W/wPmYmls+0rrOlbHLrP0emspd41pow4MrQ+JA1PpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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