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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bed55c544303aea832925d3c6b52c266c651b97ab431d6a0697b231297fe255' 
  AND token = 'Y/O+HDDtdYr/qu/8AzZXzMr8qS+1paP5WwTjL5wt12w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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