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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d205f32a6215172fc9e55a763f154fb3df1a2e680d22b3f19143ef47b2d75d7' 
  AND token = 'buc6ww0K6QKUxIcr5YNF1ajxrbNjVoQcJA0NAi6Mgl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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