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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfea182a3c09b8736e6041d9ec07cae0e6ea8f40ec73f12cbbd32b8ccdff1ea3' 
  AND token = 'j3zYNkZwEOwtW0I2m07DW0oKNGx1A+56lGmo9vmWqE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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