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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79063c473b8dca895bf5df821c217ef2fe7c0760ea0e2429533ee387b9558d02' 
  AND token = '3AbMZx+n1SYctpxt5KVqjbqiA7Ex2IbZisTn/jUl6VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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