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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d16e0e62987f0f4abe32d5dba9d7e0a8a5ccb037993c0f03dd0dabbd4f7be42' 
  AND token = 'h3QiR7dhhMDs0EN+put05T92jJyZCHdTCCYEfnfksxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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