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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f24dac5b45e4a95215a6989e3db854cfed15c175e68de14c59a95656f4116c' 
  AND token = 'exBLdUByiQ5Mtb/NyB8BP9mx8w/rTDGpSE9U6qiqkZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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