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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e453d4b25cf8e68dfa6415dff619790ac098ac8727794c53e7ce8550d92912ab' 
  AND token = 'sit5scxlLA17D7JcqJ9dbD9TnKG/rt7W8B+1FWrUehY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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