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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73930bf476c07a69fc87b9bbe65ba1c53e1a5963b031760c99c205b225c9d542' 
  AND token = '1+Yignx9IXYdZsarC8PEF9cxXVqnozkiQfiG0UAgnDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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