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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6955b6201480a0a7072ac7bba14893ccaf53863c094445fa21d5004fc4d71e0' 
  AND token = 'i6kQ804/5KubFo9/JxL+I3kmcsTHvi43tazX2xHlXys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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