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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134d8dd606698f00e5ada1ddf38b99b2cb185d7af58d97007d5d1ce30bdc0685' 
  AND token = 'JTfgjZV3A+aJEiPSj69fxhkLbJ+ngksmbBZbFUsfRoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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