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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8acc279adc9bf8059a28942bb5ea309b1d7fdd1e9ac9d1aa5e06ccb9fc0881' 
  AND token = 'PRgm6xp9VCBEUcyXwphfaLDjh47DLi3GN932q3QqisQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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