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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed395ef5d266416462356b5afde4c16ce40c39604b6f90ea1944c2ea680c8cfc' 
  AND token = 'P9R911rvGdvVYP+DsvxkIGLt9oWVYZBogO3Zd21uc7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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