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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a20cff64d61d14f2ec4f9631149f6e447ec4d2c32402a71e0f712451f19dd67' 
  AND token = 'Ry1q6s38hU86I3jmdm8MiyqMGQslnCxmUZzmq66cONc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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