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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1712e0f073f06b1563e8190d8181b35f85a83ef80fde689cbc0cf587b9045ad' 
  AND token = 'S/zY9SNWwkwFQgX+m2B6f6XQsXoP3UnRXGaByOAeT7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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