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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c32c7b7ff32b6b540b2e161e0361d6149876e3757d0b27c39a81a110695d4a1' 
  AND token = '9avHK+mL/XbISe/e8ZwTHS9YaU1KoUH02nAhUIID5CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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