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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7155ac590332c10033f715b2a76e5f2749066ff52327e45ff6abb82d7fa2a7a' 
  AND token = '6zwXpmdu/ciaavbDAr9BnCwacAvKyhrthn+cTC7R8Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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