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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94570a7038c16fd97d2ff890a393e4c8866c13be67298b88971517f98f6e7a2a' 
  AND token = 'MWjK/UrZHpGUApXXTE8wA5jldZGFRtW0Ez6Yi8s83Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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