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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2684d36e3f4248e8ede9bc26ca6052b5410a47f5d99d501bba8472d97744857a' 
  AND token = 'j+A2zRp/59ZvdTotiOyDbOy9hHiwh4LFOeR0p097f8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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